Serola Theory | Part 2: Muscular Adaptation Patterns

________________________________________________________________________________________________________________________________________

5281 Zenith Parkway | Loves Park, IL 61111 Info: 815-636-2780 · Orders only: 1-800-624-0008 · Fax: 815-636-2781

The Sacroiliac Nutation Syndrome, Part 2: Muscular Adaptation Patterns

Home > Serola Theory > Part 2 Illustrations

Figure 1 - Animation

Nutation

Nutation is anterior/inferior movement of the sacrum with relative posterior/inferior movement of the ilia. As the ilia move backwards, the pelvis narrows and the ilia approach each other posteriorly...

Figure 2 - Animation

Gravitational Line

The gravitational line passes anterior to the sacral pivot and posterior to the innominate pivot, resulting in anterior rotation of the sacrum and posterior rotation of the ilium...

Figure 3

Two dimensional view of SIJ surfaces. The articular part appears to be "L" shaped. Weight bearing occurs at the posterior syndesmosis, which is 1.57 times as large as the synovial part.

Figure 4

Piriformis and obturator externus function together

The piriformis and obturator externus, both external hip rotators, act like pliers at the SI Joint, pulling the sacral base posterior and the ilia anterior into counternutation.

Figure 5- Animation

Psoas

The psoas combines with the iliacus to create another pliers type pairing, pulling the SIJ into counternutation.

Figure 6 - Animation

Superficial and deep erector spinae function separately

Superficial Group on left: causes nutation by pulling the mid and upper thoracics posterior while pulling the sacrum anterior...

Figure 7

L3 as a relay between spinalis and deep erector spinae

L3 is the lowest truly moveable vertebra and the peak of the lumbar curve. It serves as a relay station between...

Figure 8

Multifidus

Although it spans the entire spine, the multifidus which is usually referred to is at the lumbosacral area, where it induces nutation.

Figure 10 - Animation

Quadratus lumborum

The quadratus lumborum lifts the ilium superiorly and anteriorly, bends the spine laterally, and may rotate the spine ipsilaterally.

Figure 11 - Animation

Anterior thigh counternutation muscles function together

The Anterior fibers of the gluteus medius & gluteus minimus, along with the tensor fascia lata, rectus femoris, and sartorius, act together to pull...

Figure 13

Internal and external obliques function together

The fascia of the right internal & left external obliques interdigitate at the linea alba to function as a unit in inducing counternutation on the right side and, simultaneously, nutation on theleft side.

Figure 14 - Animation

Internal oblique

The internal oblique works with the contralateral external oblique to rotate the rib cage down and toward the pelvis, flattening the ipsilateral lumbar spine, while pulling the pelvis anteriorly into counternutation.

Figure 15 - Animation

External oblique

The external oblique causes ipsilateral nutation by pulling the ilium posteriorly, while rotating the rib cage down and towards the contralateral pelvis, increasing the ipsilateral lordosis. It also assists the contralateral internal oblique in inducing contralateral counternutation.

Figure 16

Transverse abdominis

The transverse abdominis is active in both nutation and counternutation but primarily in nutation. In nutation, it increases lumbar lordosis and pulls the ilia posteriorly.

Figure 17

Latissimus dorsi and gluteus maximus function together

Together, the latissimus dorsi and opposite gluteus maximus muscles create a force that induces nutation on the gluteal side and counternutation on the latissimus dorsi side. In a right SI lesion, the left GM and right LD will contract and the right GM and left LD will be inhibited.

Figure 18

Gluteus maximus

Seen from the side, the gluteus maximus, by its attachment at the ilium, pulls the ilIum posteriorly and, by its attachment at the upper thigh, extends the leg.

Figure 19

Front and back muscle slings function together

In a counternutation response to a right sacroiliac nutation lesion, the right latissimus dorsi and left gluteus maximus pull the...

Figure 20 - Animation

Superior and inferior muscles function together

The rectus abdominis, hamstrings, and posterior head of the adductor magnus pull the ilia posteriorly into nutation. These muscles would be inhibited on the side of a nutation lesion.

Figure 12 - Animation

Medial thigh counternutation muscles function together

The pectineus, adductor brevis, adductor longus, anterior head of adductor magnus, and gracilis, as a group, rotate the ilia forward to induce counternutation.

Figure 21

Structural compensation patterns

In a state of over-compensation: the anterior-posterior spine is relatively straight above L3, with an increased lumbo-sacral angle, hips flexed, and feet turned out and pronated. Not shown: lateral flexion and rotational imbalances.

Figure 9

Deep paraspinal muscles

The deep muscles narrow the distance between the spinous or transverse processes, flattening or increasing curvature, depending on their attachments.

| | | | | |